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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Plethysmography Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Hookah Smoking on Blood Flow to the Heart, Muscle and Skin

NCT02147665
View directory record Official record
Conditions
Hookah Smoking
Interventions
Hookah smoking
Other
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 39 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 12, 2020 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Not applicable Interventional Results available

Phosphodiesterase Type 5 Inhibition to Improve Endothelial Function and Vascular Remodeling in Chronic Kidney Disease and End Stage Renal Disease Patients Requiring New Arteriovenous Fistula

NCT02414204
View directory record Official record
Conditions
Improve Endothelial Function and Decrease Vascular Stenosis
Interventions
Sildenafil, Placebo
Drug · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years to 99 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 11, 2019 · Synced Sep 29, 2026, 4:41 AM EDT
Recruiting No phase listed Observational

Testosterone Deficiency and Endothelial Dysfunction After Spinal Cord Injury

NCT07227740
View directory record Official record
Conditions
Spinal Cord Injuries, Endothelial Dysfunction, Testosterone Deficiency
Interventions
Intra-arterial Infusion of Vasoactive Agents, Intra-arterial Vitamin C Infusion, Blood Sampling
Diagnostic Test
Lead sponsor
Craig Hospital
Other
Eligibility
18 Years to 89 Years · Male only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Englewood, Colorado
Source: ClinicalTrials.gov public record
Updated Nov 20, 2025 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Not applicable Interventional

Trial of Diet in Gestational Diabetes Mellitus: Metabolic Consequences to Mother and Offspring

NCT02244814
View directory record Official record
Conditions
Gestational Diabetes Mellitus
Interventions
Low Carbohydrate/Conventional, Choosing Healthy Options in Carbohydrate Energy
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
Up to 36 Years
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Dec 18, 2020 · Synced Sep 29, 2026, 4:41 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Therapeutic Omegas for Triglyceride Suppression

NCT04349475
View directory record Official record
Conditions
Pregnancy
Interventions
Intervention Omega 3 Supplementation, Placebo Soybean Oil
Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
0 Years to 39 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
2
States / cities
Aurora, Colorado • Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Aug 30, 2026 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Phase 4 Interventional Results available

Comparison of Nebivolol and Metoprolol With Exercise and Angiotensin II in Hypertensive Patients

NCT01502787
View directory record Official record
Conditions
Hypertension
Interventions
Metoprolol succinate, Nebivolol, Forearm blood flow, Microneurography, Rhythmic handgrip exercise, Lower body negative pressure, Angiotensin II
Drug · Procedure
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jul 6, 2020 · Synced Sep 29, 2026, 4:41 AM EDT
Completed No phase listed Observational

Early Detection and Management of Bronchiolitis Obliterans Syndrome Following Pediatric Hematopoietic Stem Cell Transplantation

NCT03072849
View directory record Official record
Conditions
Bronchiolitis Obliterans Syndrome
Interventions
Pulmonary function testing, FAM Therapy
Procedure · Drug
Lead sponsor
Ann & Robert H Lurie Children's Hospital of Chicago
Other
Eligibility
6 Years to 18 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 18, 2024 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Insulin on Endothelin-Dependent Vascular Tone in the Forearm Circulation

NCT00001624
View directory record Official record
Conditions
Hyperinsulinemia
Interventions
Insulin
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Not listed
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1997 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 29, 2026, 4:41 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Assessing the Effects of a Topically Applied Cream to Clitoral Blood Flow

NCT01085981
View directory record Official record
Conditions
Female Sexual Dysfunction
Interventions
arginine 20%, nicotinamide .01%, niacin.1%, in LipodermPG 50%, Topical study cream, GRAS cream
Drug
Lead sponsor
East Suburban Ob Gyn
Other
Eligibility
25 Years to 60 Years · Female only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Monroeville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 11, 2010 · Synced Sep 29, 2026, 4:41 AM EDT
Enrolling by invitation No phase listed Observational

PPV vs PVI in the Supine and Prone Position

NCT07415603
View directory record Official record
Conditions
Surgeries Undergoing General Anesthesia
Interventions
Observation
Other
Lead sponsor
Joseph D. Tobias
Other
Eligibility
Not listed
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 8, 2026 · Synced Sep 29, 2026, 4:41 AM EDT
Completed No phase listed Observational

Prematurity-Related Ventilatory Control

NCT03464396
View directory record Official record
Conditions
Respiratory Control in Premature Infants
Interventions
Bedside Physiology study, Carotid Body Function Test, Room Air Challenge, Hypoxia Challenge Test, Effects of Nasal Cannula Flow, Magnetic Resonance Imaging, Echocardiogram, Blood Sample
Other · Diagnostic Test
Lead sponsor
Washington University School of Medicine
Other
Eligibility
1 Day to 28 Days
Enrollment
177 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 30, 2023 · Synced Sep 29, 2026, 4:41 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Role of Endothelial Function in SCI CVD Risk

NCT06443151
View directory record Official record
Conditions
Spinal Cord Injuries, Cardiovascular Diseases, Endothelial Dysfunction
Interventions
Brachial intra-arterial infusion of vasoactive and antioxidant drugs (acetylcholine, nitroprusside, ascorbic acid), venous occlusion plethysmography, Acetylcholine, Sodium Nitroprusside, Ascorbic acid, venous phlebotomy
Procedure · Drug
Lead sponsor
Craig Hospital
Other
Eligibility
18 Years to 89 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Englewood, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 19, 2024 · Synced Sep 29, 2026, 4:41 AM EDT
Recruiting No phase listed Observational

Respiration From Pleth Validation

NCT07449715
View directory record Official record
Conditions
Respiratory Rate Monitoring
Interventions
Physiological Monitoring with SpO₂ Sensors and Capnography
Device
Lead sponsor
Philips Clinical & Medical Affairs Global
Industry
Eligibility
4 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Sep 29, 2026, 4:41 AM EDT
Enrolling by invitation Phase 1Phase 2 Interventional Accepts healthy volunteers

Technical Development of Xe MRI

NCT07823010
View directory record Official record
Conditions
HSCT, Lung Transplant Recipient
Interventions
Hyperpolarized 129 Xenon
Drug
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
Not listed
Enrollment
550 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2030
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Sep 29, 2026, 4:41 AM EDT
Not listed No phase listed Observational

Non Contact Measurement of Vital Signs

NCT02287220
View directory record Official record
Conditions
Hypoxemia, Hypoxia
Interventions
Non-Contact Oximetry
Device
Lead sponsor
University of Virginia
Other
Eligibility
Up to 12 Months
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated May 31, 2018 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Visual and Auditory Neuromodulation of Pain Perception

NCT04281836
View directory record Official record
Conditions
Pain, Acute
Interventions
Interoceptive breathing awareness through use of audio and visual virtual technology aid, Interoceptive breathing awareness without use of audio or visual virtual reality
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 60 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 23, 2020 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Cardiac Function and Metabolism in Young Adults Born Premature (PET-MRI)

NCT03245723
View directory record Official record
Conditions
Infant,Premature
Interventions
Pulmonary Function Testing, Electrocardiogram, Positron Emission Tomography, Magnetic Resonance Imaging
Procedure
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 35 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Feb 3, 2021 · Synced Sep 29, 2026, 4:41 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

PPG to Predict Ejection Fraction and Other Echographic Data in the General Population

NCT04843371
View directory record Official record
Conditions
Valvular Heart Disease, Pericardial Disease, Cardiomyopathies
Interventions
Photoplethysmography
Diagnostic Test
Lead sponsor
Tulane University
Other
Eligibility
18 Years to 120 Years
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
3
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Mar 4, 2026 · Synced Sep 29, 2026, 4:41 AM EDT
Completed No phase listed Observational

Determinants of Early Cystic Fibrosis Lung Disease

NCT03579173
View directory record Official record
Conditions
Cystic Fibrosis in Children
Interventions
Infant PFT, Lung Clearance Index, Passive tidal breathing
Diagnostic Test
Lead sponsor
Indiana University
Other
Eligibility
1 Month to 5 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jun 21, 2022 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Not applicable Interventional

Pilot Study of Physiological Effect of High-Flow Nasal Cannula on Respiratory Pattern and Work of Breathing

NCT02514798
View directory record Official record
Conditions
COPD
Interventions
Esophageal and gastric balloons, Respiratory Inductance Plethysmography (RIP) system, Sentec transcutaneous monitoring system, High-flow humidified nasal oxygen delivery system, CPAP (Positive Control)
Other · Device
Lead sponsor
Tufts Medical Center
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 9, 2022 · Synced Sep 29, 2026, 4:41 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Brain Integrity in Survivors of Hodgkin Lymphoma Treated With Thoracic Radiation

NCT01820117
View directory record Official record
Conditions
Hodgkin Lymphoma
Interventions
Neurocognitive Evaluation, Quantitative Brain Imaging, Neurologic Evaluation, Health Questionnaire, Vascular Testing, Cardiopulmonary Exercise Testing, Echocardiography, Pulmonary Function Testing, Serum Biomarkers, Ophthalmology Examination
Other · Procedure
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
18 Years and older
Enrollment
416 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 28, 2018 · Synced Sep 29, 2026, 4:41 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effect of Dietary Sodium Intake on Vascular Endothelium

NCT01550315
View directory record Official record
Conditions
Postural Tachycardia Syndrome (POTS)
Interventions
Pulsitile Arterial Tonometry (PAT) Protocol, Calf Blood Flow in Reactive Hyperemia (CBF-RH), Evaluation of Forearm-Mediated Dilation
Procedure · Device
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2021
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 4, 2022 · Synced Sep 29, 2026, 4:41 AM EDT
Completed No phase listed Observational

Prediction of Extubation Readiness in Extreme Preterm Infants by the Automated Analysis of CardioRespiratory Behavior

NCT01909947
View directory record Official record
Conditions
Prediction of Extubation Readiness
Interventions
Cardiorespiratory signal acquisition
Other
Lead sponsor
McGill University Health Centre/Research Institute of the McGill University Health Centre
Other
Eligibility
Not listed
Enrollment
266 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
2
States / cities
Detroit, Michigan • Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Mar 31, 2019 · Synced Sep 29, 2026, 4:41 AM EDT
Recruiting No phase listed Observational

Surveillance Trial of the Apple Watch in Reliable Burden Assessment in Unseen Recurrence of Surgically Treated AF

NCT07122947
View directory record Official record
Conditions
Atrial Fibrillation
Interventions
Apple Watch: AFib History, Zio Patch
Device
Lead sponsor
The Cleveland Clinic
Other
Eligibility
22 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
2
States / cities
St Louis, Missouri • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 7, 2026 · Synced Sep 29, 2026, 4:41 AM EDT